Yeah, I found that thing too 1st time through the game. It delivers massive damage but, it's next to useless due to it being SO heavy, Mr. Sunderland has one hell of a time swinging it with any speed at all.
The chainsaw is the cat's ass...as they say!
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"...better to have a gun and not need it than to need a gun and not have it". - Slater, True Romance

Better to have a gun and not need it, than to need a gun and not have it.